#imgdiv{
    background: url(/images/main.jpg) no-repeat;
    border: 1px solid #999;
    background-size:cover;
    overflow-y: scroll;
    -webkit-filter: blur(5px); /* Chrome, Opera */
       -moz-filter: blur(5px);
        -ms-filter: blur(5px);   
            filter: blur(5px);  
}